So, em I guess I have to say something or get chewed out for positing a low content thread...

I can do about 30 mins of randori before I need a a nice sit down. An hour and a half and I need to be carried home, even if I try to pace myself.

These guys apparently do 24 hours. In a rocky environment.

Now either there are a bunch of ninjas with fitness levels that I could only dream of, or they have a very different idea to me of what randori/free practice means.

Does anyone have more info on this?

Most of what I saw in that vid was no-contact or light-contact sparring, [probably] compliant drilling, and sloppy kata. And they were wearing those weird toe-shoes instead of tabi.

. . . Also, most of it didn't really look like ninja stuff so much as typical krotty (not that they're terribly different combatively, but wouldn't ninja training involve more "remaining unseen" or "moving through difficult terrain" or something?)